Script to fit group of objects to page proportionally.

I need to go through a large document that have individual items on each page (text boxes, picture boxes, rectangles of different colors etc.)

At the moment I am doing this manually for each page:

1-group all items on the page

2-manually enlarge proportionally, and fit to page
(I use fn+Cmnd+Shift while resizing the group) so all objects including text and pictures would scale accordingly.

This is a repetitive task and seems that I will have to do the same on new documents I will recive. So I was wondering if there is a way of doing this with a script.

I found this:

https://community.adobe.com/t5/indesign-discussions/is-there-a-javascript-to-resize-a-frame-to-page-margin-bleed-or-slug/m-p/7288149

var doc = app.activeDocument;
var myPage = doc.pages[0];
var fit = myPage.bounds;
var myFrame = app.selection[0];
myFrame.geometricBounds = fit;

The above is similar to what I am after but it scales the objects, and the contents remain the same. So for instance, it will enlarge the text box but the text stays the same size.

Is there a way of scaling to fit the page with contents and and keeping the proportions? Maybe a shortcut or better still a script? Or maybe I could tweak the script above so that it scales pictures and text proportionally?

Any guidance or ideas welcome.

Thanks.